purecrypter | 565517ddfa6d09fa094c5dbddfe70447d0fcc0f2dfe66bba5f9f9ef73c47c6d6

Analysis

max time kernel
150s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
07-11-2024 08:50

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General

Target

7ad55278a8285dace5bb637348e5990c356a7c35bbcb8e2d53fd3dc64573d4c0.exe
Size

427KB
MD5

c34729173ecc820eb7674431597d78be
SHA1

884f343876a8bb0ebac63c28191c22c6f69590f8
SHA256

7ad55278a8285dace5bb637348e5990c356a7c35bbcb8e2d53fd3dc64573d4c0
SHA512

f9c93a0c6f55217016fe5ba550e9948662901b9240662708ac93074bf9692427b73ce10864927026b118aeb6622a47cfa04976bbc9b482a31aef21a5c96786a0
SSDEEP

3072:yvGyYiSDnt1Et5CmPo8VGAnxoctr6Byd4TUISI:24UCp6n756BmlI

Score

10^/10

purecrypter discovery downloader loader persistence

Malware Config

Extracted

Family

purecrypter

https://www.filifilm.com.br/images/colors/purple/Vygvixuyhs.bmp

Signatures

PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
loader downloader purecrypter
Purecrypter family
purecrypter
Executes dropped EXE 1 IoCs

Processes:

SETUP_~1.EXE

pid process

436 SETUP_~1.EXE

pid	process
436	SETUP_~1.EXE

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

7ad55278a8285dace5bb637348e5990c356a7c35bbcb8e2d53fd3dc64573d4c0.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\wextract_cleanup0 = "rundll32.exe C:\\Windows\\system32\\advpack.dll,DelNodeRunDLL32 \"C:\\Users\\Admin\\AppData\\Local\\Temp\\IXP000.TMP\\\""	7ad55278a8285dace5bb637348e5990c356a7c35bbcb8e2d53fd3dc64573d4c0.exe

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
discovery

System Language Discovery
T1614.001

Processes:

SETUP_~1.EXE

description ioc process

Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language SETUP_~1.EXE
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

SETUP_~1.EXE

description pid process

Token: SeDebugPrivilege 436 SETUP_~1.EXE

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	SETUP_~1.EXE

description	pid	process
Token: SeDebugPrivilege	436	SETUP_~1.EXE

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

7ad55278a8285dace5bb637348e5990c356a7c35bbcb8e2d53fd3dc64573d4c0.exe

description	pid	process	target process
PID 4700 wrote to memory of 436	4700	7ad55278a8285dace5bb637348e5990c356a7c35bbcb8e2d53fd3dc64573d4c0.exe	SETUP_~1.EXE
PID 4700 wrote to memory of 436	4700	7ad55278a8285dace5bb637348e5990c356a7c35bbcb8e2d53fd3dc64573d4c0.exe	SETUP_~1.EXE
PID 4700 wrote to memory of 436	4700	7ad55278a8285dace5bb637348e5990c356a7c35bbcb8e2d53fd3dc64573d4c0.exe	SETUP_~1.EXE

C:\Users\Admin\AppData\Local\Temp\7ad55278a8285dace5bb637348e5990c356a7c35bbcb8e2d53fd3dc64573d4c0.exe
"C:\Users\Admin\AppData\Local\Temp\7ad55278a8285dace5bb637348e5990c356a7c35bbcb8e2d53fd3dc64573d4c0.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:4700
- C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\SETUP_~1.EXE
  C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\SETUP_~1.EXE
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:436

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/436-5-0x0000000074C7E000-0x0000000074C7F000-memory.dmp

Filesize
4KB

Download
memory/436-6-0x0000000000940000-0x0000000000952000-memory.dmp

Filesize
72KB

Download
memory/436-7-0x0000000074C70000-0x0000000075420000-memory.dmp

Filesize
7.7MB

Download
memory/436-8-0x0000000074C7E000-0x0000000074C7F000-memory.dmp

Filesize
4KB

Download
memory/436-9-0x0000000074C70000-0x0000000075420000-memory.dmp

Filesize
7.7MB

Download